KwickClips Databases and SQL · 39 sec · free
What does an aggregate function return?
Short answer. One value for many rows.
Name the five aggregates.
COUNT, SUM, AVG, MAX and MIN.
Remember
| Many rows in |
| One value out |
| COUNT SUM AVG MAX MIN |
How does a whole column become one number? An aggregate reads a whole column. Here are four marks. It adds them. One value comes out. Many rows go in. One value comes out. Five functions do this.
This clip is from the full lesson: Aggregate Functions: COUNT, SUM, AVG, MAX and MIN — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 9 Computer Applications (165), CBSE Class 12 Computer Science (083), CBSE Class 12 Informatics Practices (065)
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